package com.atguigu.gulimall.order.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.constant.ProductConstant;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.SecKillOrderTo;
import com.atguigu.common.utils.R;
import com.atguigu.common.vo.MemberRespVo;
import com.atguigu.gulimall.order.constant.OrderConstant;
import com.atguigu.gulimall.order.dao.OrderItemDao;
import com.atguigu.gulimall.order.entity.OrderItemEntity;
import com.atguigu.gulimall.order.entity.PaymentInfoEntity;
import com.atguigu.gulimall.order.enume.OrderStatusEnum;
import com.atguigu.gulimall.order.feign.CartFeignService;
import com.atguigu.gulimall.order.feign.MemberFeignService;
import com.atguigu.gulimall.order.feign.ProductFeignService;
import com.atguigu.gulimall.order.feign.WmsFeignService;
import com.atguigu.gulimall.order.interceptor.LoginUserInterceptor;
import com.atguigu.gulimall.order.service.OrderItemService;
import com.atguigu.gulimall.order.service.PaymentInfoService;
import com.atguigu.gulimall.order.to.OrderCreateTo;
import com.atguigu.gulimall.order.vo.*;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import io.seata.spring.annotation.GlobalTransactional;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.aop.framework.AopContext;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.util.*;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.order.dao.OrderDao;
import com.atguigu.gulimall.order.entity.OrderEntity;
import com.atguigu.gulimall.order.service.OrderService;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;


@Service("orderService")
public class OrderServiceImpl extends ServiceImpl<OrderDao, OrderEntity> implements OrderService {

    private ThreadLocal<OrderSubmitVo> confirmVoThreadLocal = new ThreadLocal<>();

    @Autowired
    PaymentInfoService paymentInfoService;

    @Autowired
    OrderItemService orderItemService;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    MemberFeignService memberFeignService;

    @Autowired
    CartFeignService cartFeignService;

    @Autowired
    ThreadPoolExecutor executor;

    @Autowired
    WmsFeignService wmsFeignService;

    @Autowired
    StringRedisTemplate redisTemplate;

    @Autowired
    RabbitTemplate rabbitTemplate;


    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<OrderEntity> page = this.page(
                new Query<OrderEntity>().getPage(params),
                new QueryWrapper<OrderEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public OrderConfirmVo confirmOrder() throws ExecutionException, InterruptedException {
        OrderConfirmVo confirmVo = new OrderConfirmVo();
        MemberRespVo memberRespVo = LoginUserInterceptor.loginUser.get();
        // 获取之前的请求
        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();

        CompletableFuture<Void> getAddressFuture = CompletableFuture.runAsync(() -> {
            // 1、远程查询所有的收货地址
            // 每个线程都来共享之前的请求数据
            RequestContextHolder.setRequestAttributes(requestAttributes);
            List<MemberAddressVo> address = memberFeignService.getAddress(memberRespVo.getId());

            confirmVo.setAddress(address);
        }, executor);

        CompletableFuture<Void> cartFuture = CompletableFuture.runAsync(() -> {
            // 2、远程查询购物车所有选中的购物项
            // 每个线程都来共享之前的请求数据
            RequestContextHolder.setRequestAttributes(requestAttributes);
            List<OrderItemVo> items = cartFeignService.getCurrentUserCartItems();
            confirmVo.setItems(items);
            // feign在远程调用之前要构造请求，调用很多的拦截器
            // RequestInterceptor interceptor : requestInterceptors
        }, executor).thenRunAsync(() -> {
            List<OrderItemVo> items = confirmVo.getItems();
            List<Long> collect = items.stream().map(item -> item.getSkuId()).collect(Collectors.toList());
            R hasStock = wmsFeignService.getSkuHasStock(collect);
            List<SkuStockVo> data = hasStock.getData(new TypeReference<List<SkuStockVo>>() {
            });
            if (data != null){
                Map<Long, Boolean> map = data.stream().collect(Collectors.toMap(SkuStockVo::getSkuId, SkuStockVo::getHasStock));
                confirmVo.setStocks(map);
            }
        },executor);


        // 3、查询用户积分
        Integer integration = memberRespVo.getIntegration();
        confirmVo.setIntegration(integration);

        // TODO 5、防重令牌
        String token = UUID.randomUUID().toString().replace("-", "");
        confirmVo.setOrderToken(token);
        redisTemplate.opsForValue().set(OrderConstant.USER_ORDER_TOKEN_PREFIX+memberRespVo.getId(),token,30, TimeUnit.MINUTES);

        CompletableFuture.allOf(getAddressFuture, cartFuture).get();

        // 4、其他数据自动计算

        return confirmVo;
    }

    // 同一个对象内事务方法互调默认失效：原因：绕过了代理对象
    // 事务使用代理对象来控制的

    @Transactional(timeout = 30)    //a事务的所有设置就传播到了和他共用一个事务的方法
    public void a(){

        // b，c做任何设置都没用。都是和a共用一个事务
//        this.b();  没用
//        this.c();  没用
        OrderServiceImpl orderService = (OrderServiceImpl) AopContext.currentProxy();
        orderService.b();
        orderService.c();

//        bService.b();     // a事务
//        cService.c();     // 新事务（不回滚）
        int i = 10/0;
    }

    @Transactional(propagation = Propagation.REQUIRED,timeout = 2)
    public void b(){
    }

    @Transactional(propagation = Propagation.REQUIRES_NEW,timeout = 20)
    public void c(){
    }

    //本地事务，在分布式系统中，只能控制住自己的回滚，控制不了其他服务的回滚
    //分布式事务；最大原因：网络原因+分布式机器
    //(isolation = Isolation.REPEATABLE_READ)
    // (propagation = Propagation.REQUIRED)、(propagation = Propagation.REQUIRES_NEW)
//    @GlobalTransactional    // 高并发场景下不考虑2PC模式
    @Transactional
    @Override
    public SubmitOrderResponseVo submitOrder(OrderSubmitVo vo) {
        SubmitOrderResponseVo responseVo = new SubmitOrderResponseVo();

        MemberRespVo memberRespVo = LoginUserInterceptor.loginUser.get();
        confirmVoThreadLocal.set(vo);
        responseVo.setCode(0);

        // 1、验证令牌 【令牌的对比和删除必须保证原子性】

        // 返回的都是0和1  0 令牌失败  1 删除成功
        String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";

        String orderToken = vo.getOrderToken();

        // 原子验证令牌和删除令牌
        Long result = redisTemplate.execute(new DefaultRedisScript<Long>(script, Long.class), Arrays.asList(OrderConstant.USER_ORDER_TOKEN_PREFIX + memberRespVo.getId()), orderToken);
        if (result == 0L){
            // 令牌验证失败
            responseVo.setCode(1);
            return responseVo;
        }else {
            // 令牌验证通过
            // 1、下单：创建订单，验令牌，验价格，锁库存。。。
            OrderCreateTo order = createOrder();

            // 2、验价格
            BigDecimal payAmount = order.getOrder().getPayAmount();
            BigDecimal payPrice = vo.getPayPrice();
            if (Math.abs(payAmount.subtract(payPrice).doubleValue())<0.01){
                // 金额对比成功
                // TODO 3、保存订单
                saveOrder(order);

                // 4、库存锁定。只要有异常回滚订单数据
                // 订单号，订单项（skuId，skuName，num）
                WareSkuLockVo lockVo = new WareSkuLockVo();
                lockVo.setOrderSn(order.getOrder().getOrderSn());
                List<OrderItemVo> locks = order.getOrderItems().stream().map(item -> {
                    OrderItemVo itemVo = new OrderItemVo();
                    itemVo.setSkuId(item.getSkuId());
                    itemVo.setCount(item.getSkuQuantity());
                    itemVo.setTitle(item.getSkuName());
                    return itemVo;
                }).collect(Collectors.toList());

                lockVo.setLocks(locks);
                // TODO 4、远程库存锁定
                // 库存成功了，但是网络原因超时了；订单回滚了 库存不滚；
                // 为了保证高并发。库存服务自己回滚。可以发消息给库存服务；
                // 库存服务本身也可以使用自动解锁模式； 消息队列
                R r = wmsFeignService.orderLockStock(lockVo);
                if (r.getCode() == 0){
                    // 锁定成功
                    responseVo.setOrder(order.getOrder());

                    // TODO 5、远程扣减积分 出异常
//                    int i = 10/0; //订单回滚
                    // TODO 订单创建成功发送消息给MQ
                    rabbitTemplate.convertAndSend("order-event-exchange", "order.create.order", order.getOrder());
                    return responseVo;
                }else {
                    // 锁定失败
                    String msg = (String) r.get("msg");
                    throw new NoStockException(msg);
                }
            }else {
                responseVo.setCode(2);
                return responseVo;
            }
        }

//        if(orderToken!=null && orderToken.equals(redisToken)){
//            // 令牌验证通过
//            // 删除令牌
//            redisTemplate.delete(OrderConstant.USER_ORDER_TOKEN_PREFIX + memberRespVo.getId());
//        }else {
//            // 不通过
//            return null;
//        }

    }

    @Override
    public OrderEntity getOrderByOrderSn(String orderSn) {
        OrderEntity order_sn = this.getOne(new QueryWrapper<OrderEntity>().eq("order_sn", orderSn));
        return order_sn;
    }

    @Override
    public void closeOrder(OrderEntity entity) {
        // 查询当前订单的最新状态
        OrderEntity orderEntity = this.getById(entity.getId());
        // 关单
        if (orderEntity.getStatus().intValue() == OrderStatusEnum.CREATE_NEW.getCode()){
            // 关单
            OrderEntity orderUpdate = new OrderEntity();
            orderUpdate.setId(entity.getId());
            orderUpdate.setStatus(OrderStatusEnum.CANCLED.getCode());
            this.updateById(orderUpdate);
            OrderTo orderTo = new OrderTo();
            BeanUtils.copyProperties(orderEntity, orderTo);
            // 发给MQ
            try{
                // TODO 保证消息一定会发送出去，每一个消息都可以做好日志记录。（给数据库保存每一个消息的详细信息）
                // TODO 定期扫描数据库将失败的消息再发送一次
                rabbitTemplate.convertAndSend("order-event-exchange", "order.release.other", orderTo);
            }catch (Exception e){
                // TODO 将没发送成功的消息进行重试。

            }
        }
    }

    @Override
    public PayVo getOrderPay(String orderSn) {
        PayVo payVo = new PayVo();
        OrderEntity order = this.getOrderByOrderSn(orderSn);

        BigDecimal decimal = order.getPayAmount().setScale(2, BigDecimal.ROUND_UP);
        payVo.setTotal_amount(decimal.toString());
        payVo.setOut_trade_no(order.getOrderSn());

        List<OrderItemEntity> order_sn = orderItemService.list(new QueryWrapper<OrderItemEntity>().eq("order_sn", orderSn));
        OrderItemEntity entity = order_sn.get(0);
        payVo.setSubject(entity.getSkuName());
        payVo.setBody(entity.getSkuAttrsVals());
        return payVo;
    }

    @Override
    public PageUtils queryPageWithItem(Map<String, Object> params) {
        MemberRespVo memberRespVo = LoginUserInterceptor.loginUser.get();

        IPage<OrderEntity> page = this.page(
                new Query<OrderEntity>().getPage(params),
                new QueryWrapper<OrderEntity>().eq("member_id", memberRespVo.getId()).orderByDesc("id")
        );

        List<OrderEntity> order_sn = page.getRecords().stream().map(order -> {
            List<OrderItemEntity> itemEntities = orderItemService.list(new QueryWrapper<OrderItemEntity>().eq("order_sn", order.getOrderSn()));
            order.setItemEntities(itemEntities);
            return order;
        }).collect(Collectors.toList());

        page.setRecords(order_sn);
        return new PageUtils(page);
    }

    /**
     * 处理支付宝的支付结果
     * @param vo
     * @return
     */
    @Override
    public String handlePayedResult(PayAsyncVo vo) {

        // 1、保存交易流水
        PaymentInfoEntity infoEntity = new PaymentInfoEntity();
        infoEntity.setAlipayTradeNo(vo.getTrade_no());
        infoEntity.setOrderSn(vo.getOut_trade_no());
        infoEntity.setPaymentStatus(vo.getTrade_status());
        infoEntity.setCallbackTime(vo.getNotify_time());

        paymentInfoService.save(infoEntity);

        // 2、修改订单的状态信息
        if (vo.getTrade_status().equals("TRADE_SUCCESS") || vo.getTrade_status().equals("TRADE_FINISHED")){
            // 支付成功
            String outTradeNo = vo.getOut_trade_no();
            this.baseMapper.updateOrderStatus(outTradeNo, OrderStatusEnum.PAYED.getCode());
        }
        return "success";
    }

    @Override
    public void createSecKillOrder(SecKillOrderTo secKillOrder) {
        // TODO 保存订单信息
        OrderEntity orderEntity = new OrderEntity();
        orderEntity.setOrderSn(secKillOrder.getOrderSn());
        orderEntity.setMemberId(secKillOrder.getMemberId());

        orderEntity.setStatus(OrderStatusEnum.CREATE_NEW.getCode());

        BigDecimal multiply = secKillOrder.getSeckillPrice().multiply(new BigDecimal("" + secKillOrder.getNum()));
        orderEntity.setPayAmount(multiply);
        this.save(orderEntity);

        // TODO 保存订单项信息
        OrderItemEntity orderItemEntity = new OrderItemEntity();
        orderItemEntity.setOrderSn(secKillOrder.getOrderSn());
        orderItemEntity.setRealAmount(multiply);
        // TODO 获取当前SKU的详细信息进行设置 productFeignService.getSpuInfoBySkuId()
        orderItemEntity.setSkuQuantity(secKillOrder.getNum());

        orderItemService.save(orderItemEntity);

    }

    /**
     * 保存订单数据
     * @param order
     */
    private void saveOrder(OrderCreateTo order) {
        OrderEntity orderEntity = order.getOrder();
        orderEntity.setModifyTime(new Date());
        this.save(orderEntity);

        List<OrderItemEntity> orderItems = order.getOrderItems();
        orderItemService.saveBatch(orderItems);

    }

    private OrderCreateTo createOrder(){
        OrderCreateTo createTo = new OrderCreateTo();
        // 1、生成一个订单号
        String orderSn = IdWorker.getTimeId();
        // 创建一个订单号
        OrderEntity orderEntity = buildOrder(orderSn);

        // 2、获取到所有订单项
        List<OrderItemEntity> itemEntities = buildOrderItems(orderSn);

        // 3、 计算价格、积分等相关信息
        computePrice(orderEntity, itemEntities);
        createTo.setOrder(orderEntity);
        createTo.setOrderItems(itemEntities);
        return createTo;
    }

    private void computePrice(OrderEntity orderEntity, List<OrderItemEntity> itemEntities) {
        BigDecimal total = new BigDecimal("0.0"); // 订单的总额，叠加订单项价格
        BigDecimal coupon = new BigDecimal("0.0"); // 优惠券总额
        BigDecimal integration = new BigDecimal("0.0"); // 积分总额
        BigDecimal promotion = new BigDecimal("0.0");   // 促销优惠总额
        BigDecimal gift = new BigDecimal("0.0");    // 赠送积分
        BigDecimal growth = new BigDecimal("0.0");  // 成长积分
        //  订单的总额，叠加订单项价格
        for (OrderItemEntity entity : itemEntities) {
            coupon = coupon.add(entity.getCouponAmount());
            integration = integration.add(entity.getIntegrationAmount());
            promotion = promotion.add(entity.getPromotionAmount());
            total = total.add(entity.getRealAmount());
            gift = gift.add(new BigDecimal(entity.getGiftIntegration().toString()));
            growth = growth.add(new BigDecimal(entity.getGiftGrowth().toString()));
        }

        // 1.订单价格相关
        orderEntity.setTotalAmount(total);
        // 应付总额
        orderEntity.setPayAmount(total.add(orderEntity.getFreightAmount()));

        orderEntity.setPromotionAmount(promotion);
        orderEntity.setIntegrationAmount(integration);
        orderEntity.setCouponAmount(coupon);

        // 设置积分等信息
        orderEntity.setIntegration(gift.intValue());
        orderEntity.setGrowth(growth.intValue());

        orderEntity.setDeleteStatus(0);

    }

    private OrderEntity buildOrder(String orderSn) {
        MemberRespVo memberRespVo = LoginUserInterceptor.loginUser.get();
        OrderEntity entity = new OrderEntity();
        entity.setOrderSn(orderSn);
        entity.setMemberId(memberRespVo.getId());

        // 获取收货地址信息
        OrderSubmitVo submitVo = confirmVoThreadLocal.get();
        // 获取收货地址信息
        R fare = wmsFeignService.getFare(submitVo.getAddrId());
        FareVo fareResp = fare.getData(new TypeReference<FareVo>() {
        });

        // 设置运费信息
        entity.setFreightAmount(fareResp.getFare());
        // 设置收货人信息
        entity.setReceiverCity(fareResp.getAddress().getCity());
        entity.setReceiverDetailAddress(fareResp.getAddress().getDetailAddress());
        entity.setReceiverName(fareResp.getAddress().getName());
        entity.setReceiverPhone(fareResp.getAddress().getPhone());
        entity.setReceiverPostCode(fareResp.getAddress().getPostCode());
        entity.setReceiverProvince(fareResp.getAddress().getProvince());
        entity.setReceiverRegion(fareResp.getAddress().getRegion());

        // 设置订单的相关状态信息
        entity.setStatus(OrderStatusEnum.CREATE_NEW.getCode());
        return entity;
    }

    /**
     * 构建所有订单项数据
     * @param cartItem
     * @return
     */
    private List<OrderItemEntity> buildOrderItems(String orderSn) {
        // 最后确定每个购物项的价格
        List<OrderItemVo> currentUserCartItems = cartFeignService.getCurrentUserCartItems();
        if(currentUserCartItems!=null && currentUserCartItems.size()>0){
            List<OrderItemEntity> itemEntities = currentUserCartItems.stream().map(cartItem -> {
                OrderItemEntity itemEntity = buildOrderItem(cartItem);
                itemEntity.setOrderSn(orderSn);
                return itemEntity;
            }).collect(Collectors.toList());
            return itemEntities;
        }
        return null;
    }

    /**
     * 构建某个订单项
     * @param cartItem
     * @return
     */
    private OrderItemEntity buildOrderItem(OrderItemVo cartItem) {
        OrderItemEntity itemEntity = new OrderItemEntity();
        // 1、订单信息；订单号

        // 2、商品的spu信息
        Long skuId = cartItem.getSkuId();
        R r = productFeignService.getSpuInfoBySkuId(skuId);
        SpuInfoVo data = r.getData(new TypeReference<SpuInfoVo>() {
        });
        itemEntity.setSpuId(data.getId());
        itemEntity.setSpuBrand(data.getBrandId().toString());
        itemEntity.setSpuName(data.getSpuName());
        itemEntity.setCategoryId(data.getCatalogId());
        // 3、商品的sku信息
        itemEntity.setSkuId(cartItem.getSkuId());
        itemEntity.setSkuName(cartItem.getTitle());
        itemEntity.setSkuPic(cartItem.getImage());
        itemEntity.setSkuPrice(cartItem.getPrice());
        String skuAttr = StringUtils.collectionToDelimitedString(cartItem.getSkuAttr(), ";");
        itemEntity.setSkuAttrsVals(skuAttr);
        itemEntity.setSkuQuantity(cartItem.getCount());
        // 4、优惠信息[不做]

        // 5、积分信息
        itemEntity.setGiftGrowth(cartItem.getPrice().multiply(new BigDecimal(cartItem.getCount())).intValue());
        itemEntity.setGiftIntegration(cartItem.getPrice().multiply(new BigDecimal(cartItem.getCount())).intValue());

        // 6、订单项的价格信息
        itemEntity.setPromotionAmount(new BigDecimal("0"));
        itemEntity.setCouponAmount(new BigDecimal("0"));
        itemEntity.setIntegrationAmount(new BigDecimal("0"));
        // 当前订单项的实际金额
        BigDecimal origin = itemEntity.getSkuPrice().multiply(new BigDecimal(itemEntity.getSkuQuantity().toString()));
        BigDecimal subtract = origin.subtract(itemEntity.getCouponAmount())
                .subtract(itemEntity.getPromotionAmount())
                .subtract(itemEntity.getIntegrationAmount());
        itemEntity.setRealAmount(subtract);

        return itemEntity;

    }

}